US5670851A - Power conversion control system for plural electric motors and auxiliary circuit - Google Patents

Power conversion control system for plural electric motors and auxiliary circuit Download PDF

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Publication number
US5670851A
US5670851A US08/552,843 US55284395A US5670851A US 5670851 A US5670851 A US 5670851A US 55284395 A US55284395 A US 55284395A US 5670851 A US5670851 A US 5670851A
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power
main
circuit breaker
power converter
converter
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US08/552,843
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Mitsuhiro Numazaki
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Toshiba Corp
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Toshiba Corp
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Assigned to KABUSHIKI KAISHA TOSHIBA reassignment KABUSHIKI KAISHA TOSHIBA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NUMAZAKI, MITSUHIRO
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L9/00—Electric propulsion with power supply external to the vehicle
    • B60L9/16—Electric propulsion with power supply external to the vehicle using ac induction motors
    • B60L9/18—Electric propulsion with power supply external to the vehicle using ac induction motors fed from dc supply lines
    • B60L9/22—Electric propulsion with power supply external to the vehicle using ac induction motors fed from dc supply lines polyphase motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2200/00—Type of vehicles
    • B60L2200/26—Rail vehicles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Definitions

  • This invention relates to an electric vehicle control system, and more particularly to an electric vehicle control system for controlling a plurality of motors for driving an electric vehicle and an auxiliary circuit of the electric vehicle.
  • an electric vehicle control system which is composed of multiple variable voltage variable frequency (hereafter, “VVVF”) power converters, which respectively convert DC power to VVVF AC powers and supply these AC powers to electric vehicle drive motors, and a constant voltage constant frequency (hereafter, “CVCF”) power converter which converts DC power to CVCF AC power and supplies this AC power to an electric vehicle auxiliary circuit.
  • VVVF variable voltage variable frequency
  • CVCF constant voltage constant frequency
  • the design is that, when the CVCF power converter has broken down, one of the VVVF power converters is controlled so that it supplies CVCF AC power to the electric vehicle auxiliary circuit.
  • driving of the electric vehicle can be continued with normal operation of the electrically-driven air compressors, battery chargers, electrically-driven cooling air blowers, etc., which are the loads of the electric vehicle auxiliary circuit.
  • An example of such a control system is disclosed in Patent Disclosure (Kokai) No. Heisei 3-98401 Gazette.
  • FIG. 7 is a block diagram of a conventional electric vehicle control system constructed based on this concept.
  • VVVF inverters positive input terminals of multiple VVVF power converters (hereafter, "VVVF inverters”) 5a-5d are connected to a pantograph 1 via a circuit breaker 2a and filter reactors 3a -3d, respectively. Their negative input terminals are earthed through the wheels. Also, filter capacitors 4 are respectively connected between the positive and negative input terminals of VVVF inverters 5a-5d. Furthermore, electric vehicle drive motors (hereafter, “main motors”) 6a-6d are respectively connected to their output terminals. A specified VVVF inverter 5d out of these VVVF inverters 5a-5d is controlled by a control unit 7 so that it is also capable of driving as a CVCF power converter.
  • main motors electric vehicle drive motors
  • Control unit 7 is composed of an inverter control common unit (hereafter, "common unit") 7a for driving the switching devices for constructing VVVF inverter 5d; a VVVF control unit 7b which generates drive signals for operating the switching devices so that DC power is converted to VVVF AC power; a CVCF control unit 7c which generates drive signals for operating the switching devices so that DC power is converted to CVCF AC power; and a changeover unit 8 which controls changeover switches 81-83.
  • common unit hereafter, "common unit”
  • VVVF control unit 7b which generates drive signals for operating the switching devices so that DC power is converted to VVVF AC power
  • CVCF control unit 7c which generates drive signals for operating the switching devices so that DC power is converted to CVCF AC power
  • changeover unit 8 which controls changeover switches 81-83.
  • CVCF inverter 9 the positive input terminal of CVCF power converter (hereafter, "CVCF inverter") 9 is connected to pantograph 1 via a circuit breaker 2b and a filter reactor 3e. Its negative input terminal is earthed through the wheels. Also, filter capacitor 4 is connected between the positive and negative input terminals of CVCF inverter 9. Furthermore, the primary side of a transformer 11 is connected to its output terminals via a waveform filter circuit 10. An electric vehicle auxiliary circuit 14 including the control circuits for VVVF inverters 5a-5d and the circuits for driving electric air blowers for cooling resistors (not shown) of electric vehicle etc., is connected to the secondary side of transformer 11.
  • changeover switch 81 is provided between common unit 7a and VVVF control unit 7b and CVCF control unit 7c
  • changeover switch 82 is provided between VVVF inverter 5d and main motor 6d and waveform filter circuit 10
  • changeover switch 83 is provided between CVCF inverter 9 and waveform filter circuit 10.
  • changeover unit 8 detects this breaking down, and changes over respective switches 81-83 so that they make contact with the sides (the y terminal sides) opposite to the sides (the x terminal sides) shown in FIG. 7.
  • changeover unit 8 opens circuit breaker 2b.
  • CVCF inverter 9 is disconnected from electric vehicle auxiliary circuit 14.
  • predetermined specified VVVF inverter 5d is disconnected from main motor 6d and connected to waveform filter circuit 10.
  • CVCF control unit 7c is changed over and connected to common unit 7a. Consequently, VVVF inverter 5d operates as the CVCF inverter, and its output is supplied to transformer 11 via waveform filter circuit 10.
  • circuit breaker 2a In this state, if overcurrents flow in VVVF inverters 5a-5c due to pantograph 1 becoming separated from the overhead power line, or the like, circuit breaker 2a will sometimes open due to the operation of protective action. Also, if an instruction, such as a power instruction OFF (not shown), is outputted from the driver's cab, circuit breaker 2a will be opened in the same way. In such cases, the power supply to VVVF inverter 5d, which is operating as the power source for electric vehicle auxiliary circuit 14, will also be disconnected. Therefore, there is the problem of not being able to supply power to electric vehicle auxiliary circuit 14.
  • a power instruction OFF not shown
  • one object of this invention is to provide an electric vehicle control system which can always continue to supply AC power to an electric vehicle auxiliary circuit in case of an auxiliary power converter breakdown, independent of the state of a main power converter for supplying AC power to a main motor.
  • an electric vehicle control system for controlling a plurality of main motors for driving an electric vehicle and an auxiliary circuit of the electric vehicle.
  • the control system includes a first circuit breaker, and a first main power converter with an input side connected to the first circuit breaker and an output side connected to a first main motor out of a plurality of the main motors, for receiving a DC power through the first circuit breaker for converting the DC power into a first AC power to supply the first AC power to the first main motor.
  • the control system further includes a second circuit breaker, and an auxiliary power converter with an input side connected to the second circuit breaker and an output side connected to the auxiliary circuit, for receiving the DC power through the second circuit breaker for converting the DC power into a second AC power to supply the second AC power to the auxiliary circuit.
  • the control system also includes a second main power converter with an input side connected to one of the first circuit breaker and the second circuit breaker and an output side connected to one of a second main motor out of a plurality of the main motors and the auxiliary circuit, for receiving the DC power through one of the first and second circuit breakers for converting the DC power into a third AC power to supply the third AC power to one of the second main motor and the auxiliary circuit, respectively.
  • the control system further includes a switch device for switching the second main power converter such that when the auxiliary power converter is normal the output side of the second main converter is connected to the second main motor to supply the third AC power to the second main motor, and when the auxiliary power converter is broken down the input side of the second main power converter is connected to the second circuit breaker and the output side of the second main power converter is connected to the auxiliary circuit to supply the third AC power to the auxiliary circuit.
  • FIG. 1 is a block diagram of an electric vehicle control system showing a first embodiment of this invention
  • FIG. 2 is a block diagram of an electric vehicle control system showing a second embodiment of this invention
  • FIG. 3 is a block diagram of an electric vehicle control system showing a third embodiment of this invention.
  • FIG. 4 is a block diagram of an electric vehicle control system showing a fourth embodiment of this invention.
  • FIG. 5 is a block diagram of an electric vehicle control system showing a fifth embodiment of this invention.
  • FIG. 6 is a block diagram of an electric vehicle control system showing a sixth embodiment of this invention.
  • FIG. 7 is a block diagram of a prior art electric vehicle control system.
  • FIG. 1 is a block diagram of an electric vehicle control system showing a first embodiment of this invention.
  • Respective filter reactors 3a-3d and positive input terminals of multiple VVVF inverters 5a-5d are connected to pantograph 1 via circuit breaker 2a, while negative input terminals of VVVF inverters 5a-5d are earthed through the wheels.
  • respective filter capacitors 4 are connected between the positive and negative input terminals of VVVF inverters 5a-5d.
  • multiple main motors 6a-6d are connected to respective output terminals of VVVF inverters 5a-5d.
  • Control unit 7 is composed of common unit 7a for driving the switching devices which construct VVVF inverter 5d; VVVF control unit 7b which generates drive signals for operating the switching devices so that DC power is converted to VVVF AC power; CVCF control unit 7c which generates drive signals for operating the switching devices so that DC power is converted to CVCF AC power; and a changeover unit 8A which controls changeover switches 81-83, switches 84, 85 and 86.
  • CVCF inverter 9 is connected to pantograph 1 via circuit breaker 2b and filter reactor 3e. Its negative input terminal is earthed through the wheels.
  • filter capacitor 4 is connected between the positive and negative input terminals of CVCF inverter 9.
  • the primary side of transformer 11 is connected to its output terminals via waveform filter circuit 10.
  • Electric vehicle auxiliary circuit 14 including the control circuits for VVVF inverters 5a-5d and the circuits for driving electric air blowers for cooling resistors etc., is connected to the secondary side of transformer 11.
  • changeover switch 81 is provided between common unit 7a and VVVF control unit 7b and CVCF control unit 7c; changeover switch 82 is provided between VVVF inverter 5d and main motor 6d and waveform filter circuit 10, and changeover switch 83 is provided between CVCF inverter 9 and waveform filter circuit 10.
  • switch 84 is provided between circuit breaker 2a and filter reactor 3d; switch 85 is provided between circuit breaker 2b and filter reactor 3e; and switch 86 is provided which connects circuit breaker 2b and filter reactor 3d.
  • VVVF inverters 5a-5d respectively convert DC power collected by pantograph 1 to VVVF AC powers corresponding to the driving instruction (not shown), and supply these AC powers to main motors 6a-6d.
  • CVCF inverter 9 converts DC power collected by pantograph 1 to CVCF AC power and supplies this AC power to electric vehicle auxiliary circuit 14.
  • filter reactors 3a-3e and filter capacitors 4 reduce the ripple component of the overhead power line voltage. In addition, they also reduce the high-frequency currents generated from VVVF inverters 5a-5d and CVCF inverter 9, respectively. Also, waveform filter circuit 10 shapes the waveform outputted by CVCF inverter 9 to a sine wave, and supplies this shaped power to transformer 11.
  • CVCF inverter 9 When the output of CVCF inverter 9 is zero due to a breakdown of CVCF inverter 9 itself or of the CVCF control unit (not illustrated) which controls CVCF inverter 9, (hereinafter it may be simply stated as CVCF inverter 9 is broken down). In this time, the secondary side voltage of transformer 11 also becomes zero.
  • changeover unit 8 detects this breakdown the same way as the conventional and changes over and connects each of changeover switch 81-83 to the side (the y terminal sides) opposite to the state (the x terminal sides) shown in FIG. 1. Also, it switches switches switches 84 and 85 OFF and then switches switch 86 ON.
  • CVCF inverter 9 is disconnected from electric vehicle auxiliary circuit 14 by changeover switch 83. Also, the output terminals of VVVF inverter 5d are disconnected from main motor 6d, and, instead, the output terminals of VVVF inverter 5d are connected to waveform filter circuit 10 by changeover switch 82. Also, CVCF inverter 9 is disconnected from pantograph 1 by switch 85, and VVVF inverter 5d is disconnected from circuit breaker 2a by switch 84. Then, by switching ON switch 86, DC power is supplied from pantograph 1 to VVVF inverter 5d via circuit breaker 2b.
  • CVCF control unit 7c is changed over and connected to common unit 7a in place of VVVF control unit 7b by changeover switch 81.
  • CVCF control unit 7c generates driving signals and outputs these to common unit 7a to cause the switching devices which compose VVVF inverter 5d to operate so that the DC power is converted to CVCF power.
  • Common unit 7a drives the switching devices based on these driving signals. Therefore, VVVF inverter 5d operates as a CVCF inverter.
  • CVCF AC power outputted from VVVF inverter 5d is supplied to electric vehicle auxiliary circuit 14 via waveform filter circuit 10 and transformer 11.
  • VVVF inverter 5d receives a supply of DC power from pantograph 1 via circuit breaker 2b. Therefore, even in a case when circuit breaker 2a is opened due to overcurrents generated in VVVF inverters 5a-5c or for some other cause, VVVF inverter 5d can continue to supply CVCF AC power to electric vehicle auxiliary circuit 14.
  • VVVF inverter 5d can supply CVCF power to electric vehicle auxiliary circuit 14 without being affected by the operational states of the other VVVF inverters 5a-5c.
  • FIG. 2 is a block diagram of an electric vehicle control system showing a second embodiment of this invention.
  • VVVF inverters 5a-5c are respectively connected to pantograph 1 via circuit breaker 2a and filter reactors 3a-3c.
  • VVVF inverter 5d and CVCF inverter 9 are respectively connected to pantograph 1 via circuit breaker 2b and filter reactors 3d and 3e.
  • VVVF inverters 5a-5c DC power is supplied to VVVF inverters 5a-5c via circuit breaker 2a, while DC power is supplied to VVVF inverter 5d and CVCF inverter 9 via circuit breaker 2b.
  • a changeover unit 8B changes over and connects each of changeover switches 81-83 to the side (the y terminal sides) opposite to the state (the x terminal sides) shown in FIG. 2. Therefore, VVVF inverter 5d operates as a CVCF inverter.
  • the CVCF AC power outputted from VVVF inverter 5d is supplied to electric vehicle auxiliary circuit 14 via waveform filter circuit 10 and transformer 11.
  • VVVF inverter 5d receives a DC supply from pantograph 1 via circuit breaker 2b. Therefore, even if circuit breaker 2a opens due to the overcurrents generated in the other VVVF inverters 5a-5c or for some other reason, VVVF inverter 5d can continue to supply CVCF AC power to electric vehicle auxiliary circuit 14.
  • FIG. 3 is a block diagram of an electric vehicle control system showing a third embodiment of this invention.
  • a VVVF inverter 15a is connected to pantograph 1 via circuit breaker 2a and s filter reactor 13a, and its output terminals are connected in parallel to multiple main motors 6a-6c.
  • a filter capacitor 14a is connected between the positive and negative input terminals of VVVF inverter 15a.
  • VVVF inverter 5d is connected to pantograph 1 via circuit breaker 2a and filter reactor 3d and its output terminals are connected to main motor 6d. The rest of the composition and operation are the same as those of the first embodiment.
  • this embodiment is applied to a system provided with VVVF inverter 15a which collectively controls main motors 6a -6c and VVVF inverter 5d which individually controls main motor 6d. Accordingly, the same effect as in the first embodiment can also be obtained with this embodiment.
  • FIG. 4 is a block diagram of an electric vehicle control system showing a fourth embodiment of this invention.
  • VVVF inverter 15a is connected to pantograph 1 via circuit breaker 2a and filter reactor 13a, and its output terminals are connected in parallel to main motors 6a-6c.
  • filter capacitor 14a is connected between the positive and negative input terminals of VVVF inverter 15a.
  • VVVF inverter 5d and CVCF inverter 9 are connected to pantograph 1 via circuit breaker 2b and filter reactors 3d and 3e respectively. The remainder of the composition and operation are the same as those of the second embodiment.
  • this embodiment is applied to a system provided with collective control type VVVF inverter 15a and individual control type VVVF inverter 5d in the same way as in the third embodiment. Accordingly, the same effect as in the second embodiment can also be obtained with this embodiment.
  • FIG. 5 is a block diagram of an electric vehicle control system showing a fifth embodiment of this invention.
  • switches 87, 88 and 89 are provided instead of switches 84, 85 and 86 in the first embodiment.
  • the positions of switches 87, 88 and 89 differ from those of switches 84, 85 and 86 in the first embodiment, while the rest is the same.
  • switch 87 is provided between filter reactor 3d and VVVF inverter 5d
  • switch 88 is provided between filter reactor 3e and CVCF inverter 9
  • switch 89 is provided between filter reactor 3e and VVVF inverter 5d.
  • switches 87 and 88 are switched 0N and switch 89 is switches OFF, as shown in FIG. 5.
  • VVVF inverter 5d receives a supply of DC power from pantograph 1 via circuit breaker 2b and filter reactor 3e.
  • the constants of filter capacitors 4 of VVVF inverters 5a-5d and CVCF inverter 9 are respectively set to the same value.
  • the inductance value of filter reactor 3d is, for example, 23 mH, while that of filter reactor 3e is, for example, 23-60 mH which is varied based on the load of electric vehicle auxiliary circuit 14.
  • FIG. 6 is a block diagram of an electric vehicle control system showing a sixth embodiment of this invention.
  • switches 84a-84d are provided which open the DC input terminals of respective VVVF inverters 5a-5d, While the rest is the same. These switches 84a-84d are normally switched ON as shown in FIG. 6.
  • the broken down VVVF inverter out of VVVF inverters 5a-5d is disconnected by switching OFF the corresponding one of switches 84a-84d, while normal operation is performed by the rest of the VVVF inverters 5a-5d.
  • switch 84d which disconnects VVVF inverter 5d when it breaks down can also be used as the switch which disconnects VVVF inverter 5d from circuit breaker 2a when CVCF inverter 9 breaks down.
  • this invention is applied to the electric vehicle control system composed of multiple VVVF inverters for supplying VVVF AC powers to respective main motors and the CVCF inverter for supplying CVCF AC power to the electric vehicle auxiliary circuit.
  • This invention is not limited to these embodiments.
  • This invention can also he applied to an electric vehicle control system composed of multiple main power converters for converting DC power to first AC powers and for supplying the first AC powers to respective main motors and an auxiliary power converter for converting the DC power to a second AC power and for supplying the second AC power to the electric vehicle auxiliary circuit.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
US08/552,843 1995-03-29 1995-11-03 Power conversion control system for plural electric motors and auxiliary circuit Expired - Fee Related US5670851A (en)

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JP7028095 1995-03-29
JP7-070280 1995-03-29

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US (1) US5670851A (de)
EP (1) EP0734900B1 (de)
KR (1) KR0182337B1 (de)
CN (1) CN1040627C (de)
DE (1) DE69519984T2 (de)
EG (1) EG20960A (de)

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JP3888681B2 (ja) * 2002-08-28 2007-03-07 本田技研工業株式会社 電動車両における電源装置
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DE69519984D1 (de) 2001-03-01
CN1040627C (zh) 1998-11-11
KR960033873A (ko) 1996-10-22
DE69519984T2 (de) 2003-01-16
EP0734900B1 (de) 2001-01-24
EP0734900A1 (de) 1996-10-02
CN1134375A (zh) 1996-10-30
KR0182337B1 (ko) 1999-05-15
EG20960A (en) 2000-07-30

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